Title:
OVERHEATING PROTECTIVE DEVICE OF HIGH-VOLTAGE TRANSFORMER FOR MICROWAVE OVEN
Document Type and Number:
Japanese Patent JPH07245871
Kind Code:
A
Abstract:
PURPOSE: To prevent undue temperature rise of a high voltage transformer for microwave oven by sensing the temperature of the high voltage transformer directly and regulating power supply thereto. CONSTITUTION: A thermostat TH is bonded directly to the most heating part, i.e., the secondary coil L4 having a high number of turns, of a high voltage transformer T2. When the temperature of the secondary coil L4 is lower than a specified level, the contacts P1, P2 of the thermostat TH are kept in closed state. Consequently, power is supplied stably to the primary coil L3 through the thermostat TH and the high voltage transformer T2 and a magnetron M2 are operated normally. On the contrary, when the high voltage transformer T2 is heated over the specified temperature, the contacts P1, P2 are opened to interrupt power supply to the primary coil L3 and the operation of the high voltage transformer T2 and the magnetron M2 is interrupted. Consequently, undue temperature rise of the high voltage transformer can be prevented stably and reliably.
Inventors:
HAYASHI HEIKOU
Application Number:
JP28646094A
Publication Date:
September 19, 1995
Filing Date:
November 21, 1994
Export Citation:
Assignee:
DAEWOO ELECTRONICS CO LTD
International Classes:
H05B6/68; H01F27/40; H02H5/04; H02H7/04; H05B6/66; (IPC1-7): H02H7/04; H01F27/40; H02H5/04; H05B6/68
Domestic Patent References:
| JP50062124B | ||||
| JP58069925B | ||||
| JPS5240338U | 1977-03-22 |
Attorney, Agent or Firm:
Yosuke Goto (2 outside)
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